Description or summary of the book: Yakari discovers the joys-and the dangers-of living underground. Yakari wakes up one morning to find a series of arrows forming a trail. Following it, he soon finds himself the exasperated victim of pranks, mockeries and other vexing tomfoolery by an unknown bear cub. The young joker's hideout is a massive burrow, with multiple galleries and entrances. It's all very innocent and tame, but even the most harmless of pranks can turn dangerous when bad luck strikes...